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What advantages are associated with bilateral symmetry?

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What advantages are associated with bilateral symmetry? 

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Step 1

Symmetry is the balanced distribution of duplicate body parts or shapes within the body of an organism. In bilateral symmetry, the sagittal plane divides the organism into roughly mirror image halves. This is a trait that applies to 99% of all animals. Most animals belonging to phyla Chordata, Annelida, Arthropoda, Platyzoa, Nematoda and Mollusca have bilaterally symmetrical body. However, the internal organs are not distributed symmetrically.

Step 2

Bilateral symmetry has two main advantages:

1. Greater mobility: Animals with bilateral symmetrical body can move through the environment in a consistent direction. This helps an organism to escape from its predator faster or makes it easier to target its prey.

2. Anterior cephalization: Bilateral symmetry shows evolution of definite brain area. The sensory organs and nervous control are concentrated into a head region.

According to scientists, bi...

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Evolution and Adaptation

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